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#include <kapi/interrupts.hpp>
#include <kapi/tracked_mutex.hpp>
#include <kstd/mutex.hpp>
#include <catch2/catch_test_macros.hpp>
SCENARIO("irq_lock semantics", "[kapi][interrupts]")
{
GIVEN("a simple irq_lock")
{
auto lock = kapi::interrupts::irq_lock{};
AND_GIVEN("IRQs are currently disabled")
{
kapi::interrupts::enabled(false);
REQUIRE_FALSE(kapi::interrupts::enabled());
WHEN("locking the irq_lock")
{
lock.lock();
THEN("IRQs are still disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
AND_WHEN("unlocking the irq_lock")
{
lock.unlock();
THEN("IRQs are still disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
}
}
}
THEN("the irq_lock is locked")
{
REQUIRE_FALSE(lock.try_lock());
lock.unlock();
}
}
THEN("the irq_lock can be locked")
{
REQUIRE(lock.try_lock());
lock.unlock();
}
}
AND_GIVEN("IRQs are currently enabled")
{
kapi::interrupts::enabled(true);
REQUIRE(kapi::interrupts::enabled());
WHEN("locking the irq_lock")
{
lock.lock();
THEN("IRQs are disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
AND_WHEN("unlocking the irq_lock")
{
lock.unlock();
THEN("IRQs are enabled again")
{
REQUIRE(kapi::interrupts::enabled());
}
}
}
}
}
}
GIVEN("a wrapping irq_lock")
{
auto mutex = kapi::tracked_mutex{};
auto lock = kapi::interrupts::irq_lock{mutex};
AND_GIVEN("IRQs are currently disabled")
{
kapi::interrupts::enabled(false);
REQUIRE_FALSE(kapi::interrupts::enabled());
WHEN("locking the irq_lock")
{
lock.lock();
THEN("IRQs are still disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
AND_WHEN("unlocking the irq_lock")
{
lock.unlock();
THEN("IRQs are still disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
}
THEN("the inner mutex is unlocked")
{
REQUIRE(mutex.try_lock());
mutex.unlock();
}
}
}
THEN("the irq_lock is locked")
{
REQUIRE_FALSE(lock.try_lock());
lock.unlock();
}
THEN("the inner mutex is locked")
{
REQUIRE_FALSE(mutex.try_lock());
lock.unlock();
}
}
THEN("the irq_lock can be locked")
{
REQUIRE(lock.try_lock());
lock.unlock();
}
}
AND_GIVEN("IRQs are currently enabled")
{
kapi::interrupts::enabled(true);
REQUIRE(kapi::interrupts::enabled());
WHEN("locking the irq_lock")
{
lock.lock();
THEN("IRQs are disabled")
{
REQUIRE_FALSE(kapi::interrupts::enabled());
AND_WHEN("unlocking the irq_lock")
{
lock.unlock();
THEN("IRQs are enabled again")
{
REQUIRE(kapi::interrupts::enabled());
}
THEN("the inner mutex is unlocked")
{
REQUIRE(mutex.try_lock());
mutex.unlock();
}
}
}
THEN("the irq_lock is locked")
{
REQUIRE_FALSE(lock.try_lock());
lock.unlock();
}
THEN("the inner mutex is locked")
{
REQUIRE_FALSE(mutex.try_lock());
lock.unlock();
}
}
}
AND_GIVEN("the inner mutex is already locked")
{
auto guard = kstd::lock_guard{mutex};
THEN("the irq_lock cannot be locked")
{
REQUIRE_FALSE(lock.try_lock());
}
}
}
}
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